Curiosity ... the cat.
Curiosity killed the cat.
Every cloud has a ... lining.
Every cloud has a silver lining.
Let's ... the knot.
Let's tie the knot.
She's a ... horse.
She's a dark horse.
At the ... of a hat.
At the drop of a hat.
Take it with a ... of salt.
Take it with a grain of salt.
Don't put all your eggs in one ....
Don't put all your eggs in one basket.
... the hatchet.
Bury the hatchet.
It's a ... in disguise.
It's a blessing in disguise.
It's a ... in the bucket.
It's a drop in the bucket.
Feeling ... the weather.
Feeling under the weather.
I'll be glad to see the ... of him.
I'll be glad to see the back of him.
It's the ... of both worlds.
It's the best of both worlds.
... on the bandwagon.
Jump on the bandwagon.
Sit on the ....
Sit on the fence.
Let ... dogs lie.
Let sleeping dogs lie.
I ... a rat.
I smell a rat.
The ball is in your ....
The ball is in your court.
You're ... up the wrong tree.
You're barking up the wrong tree.
Burn the ... oil.
Burn the midnight oil.
Bite off more than you can ....
Bite off more than you can chew.
Kill ... birds with one stone.
Kill two birds with one stone.
... the hook.
Off the hook.
Cross that ... when you come to it.
Cross that bridge when you come to it.
... your tongue.
Bite your tongue.
Close, but no ....
Close, but no cigar.
As ... as a rock.
As solid as a rock.
Actions ... louder than words.
Actions speak louder than words.
Once in a ... moon.
Once in a blue moon.
A leopard can't ... its spots.
A leopard can't change its spots.
The best thing since ... bread.
The best thing since sliced bread.
It's a ... of cake.
It's a piece of cake.